Finding the Third Proportional to 16,660.69 and 18,916.03

Step by Step Solution

1. Step 1: Write the proportion equation
   16,660.69 : 18,916.03 = 18,916.03 : x
2. Step 2: Convert to fraction form
   16,660.69/18,916.03 = 18,916.03/x
3. Step 3: Cross multiply
   16,660.69x = 18,916.03 × 18,916.03
4. Step 4: Simplify right side
   16,660.69x = 357,816,238.25
5. Step 5: Solve for x
   x = 357,816,238.25/16,660.69
6. Step 6: Final answer
   x = 21,476.68